| All Patents in class 29/27B |
Patents 31 -
45
of 77
      |
| Number | Date | Patentee | Title | Type |
| 586,514 | Jul. 13, 1897 | P.B. Bosworth | Commutator Truing Device | commutator dressing machines |
| 593,491 | Nov. 09, 1897 | W.B. Pearson | Horizontal drilling and boring machine | horizontal drilling machines |
| 651,342 | Jun. 12, 1900 | E.D. Carr | Commutator-Truing Device | commutator truing tools |
| 857,931 | Jun. 25, 1907 | C.H. Frick | Tool for Turning and Dressing Commutators | commutator dressing machines |
| 859,059 | Jul. 02, 1907 | C.J. Haeberli, H.E. Schmidt | Angular bit-brace | braces |
| 908,664 | Jan. 05, 1909 | F. Hardinge | Lathe structure | |
| 913,312 | Feb. 23, 1909 | E.B. Sellew | Boring, Turning, and Facing Machine | drilling and boring |
| 941,269 | Nov. 23, 1909 | W.A. Pearn, F. Pearn | Machine for milling, facing, and other metal-cutting operations | metal lathes |
| 945,784 | Jan. 11, 1910 | O.E. Hunt | Commutator Truing Machine | commutator truing tools |
| 971,753 | Oct. 04, 1910 | O.E. Hunt | Commutator Truing Machine | |
| 1,000,442 | Aug. 15, 1911 | W.L. Schellenbach | Lathe | lathe tool holders and tool posts |
| 1,130,276 | Mar. 02, 1915 | J. Hartness | Automatic chucking-lathe | metal lathes |
| 1,130,277 | Mar. 02, 1915 | J. Hartness | Multispindle lathe | multiple spindle lathes |
| 1,144,744 | Jun. 29, 1915 | L.R. Wheeler | Machine Tool | milling machines |
| 1,194,864 | Aug. 15, 1916 | F. Müller | Machine for making twist drills | metal lathes |
